Taking Confucius as a reference, the scale of the Three Kingdoms period was smaller than that of the Spring and Autumn Period and the Warring States Period. Guan Yu and Confucius are both nine feet tall, but Guan Yu's height should be around 185, and Zhang Fei and Zhuge Liang are both eight feet, nearly 170.
In addition to scale, beautifying characters is also a habit of historical writing, so heroes in history do exist, and many of them are of medium height or even short stature.